Air-cooling system for explosive engines



May 2o, 1924.

J. EDMA'N' AIR COOLING SYSTEM FORVEXPLOSIVE ENGINES Original Filed June 50 .n 1919 2 Sheets-Sheet 1 Illi .May 2o. 1924.

, J. EDMAN AIR COOLING SYSTEM FOR EXPLOSIVE ENGINES s-Sheet Patented May Pat), 1924.

illTED STATES JOHN EDMAN, OE MINNEAPOLIS, MINNESOTA, ASSIGNOR TO AIR COOLINGMOTOKR CO.,V

PATENT Erie.

OF MINNEAPOLIS, MINNESOTA, A CORPORATION OFIVIINNESOTA.

AIR-COOLING SYSTEM FOR EXPLOSIVE ENGINES.

Application led .Tune 30, 1919, Serial No, 307,833. Renewed October 27, 1923.

be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates'to internal combustion engines and has for its object to provide efficient means for cooling the piston and preferably also, the cylinders thereof. i Generally stated, the invention consists ofthe novel devices and combination of-devicesv hereinafter described and defined lin the claims.

II'itherto, the cylinders of the internal combustion engine have been cooled sometimes by the use of water and sometimes by a forced circulation of air, but generally, no means has been provided directly for cooling the pistons. As the cylinders are kept cooler than the pistons, the latter will expand out of proportion to the expansion of the cylinders, and when the engines run at high speed or under a high duty, much trouble has been caused by sticking or socalled, freezing of 4the pistons in the cylinders. Y

My invention provides means whereby, a forced circulation of cold air through a chamber of the engine is produced, thereby, keeping pistons at proper temperature. This means for cooling the piston may be used in connection wit-l1 cylinders, that are air cooled or cooled by circulation of water.

The invention is illustrated in the accom` panying drawings, wherein like characters indicate like parts throughout the several views.

Referring to the drawings:

Fig. 1 is a vertical or axial section through the cylinder and piston of an internal combustion engine, some parts being broken away, and illustrating my invention applied thereto; y V n Fig. 2 is a horizontal section on the line 2-2 of Fig. 1;

Fig. 3 is a horizontal section on the line 3-3 of Fig. 1.

As a further feature of this invention,

I provide means whereby the air circulated through the piston will` also be circulated through the head or other portions of the cylinder, thereby, keeping the cylinder also relatively or comparatively cool. The numeral 4t indicates the cylinder, and the numeral 5 the piston of the engine. rIhe numeral 6 indicates the usual connecting rod.

In accordance y'with lmy invention, the cylinder 4 in its head-6 is formed with a chamber l7, and the piston 5 in its head is formed with 'a chamberr 8. The cylinder `head 6 at its axis `is provided with a solid hub surrounded by `the chamber 7 and through which hub is extended a threaded seat 9 for the customary spark plug not shown. 'The chamber 8 in the piston head has internal partitions or baiiie flanges 10 that overlap so that the air in passing through said chamber will be caused to take tortuous course on its way from intake port 11 to outlet port`12, both of which ports are formed in the top web of `said piston head. I

tached to the piston head and respectively communicate 'with `the ports 11 and 12. These tubes 13 and 14 are also'pa'rallel to the axis of the piston, and both thereof work through the solid portion of the cylin-` der head 6. The upper or outer portion of tube 13 works telescopically within an outer tube 15, the endof which is threaded or otherwise,'secured rigidly to the cylinder head 6. At its extended end, outer tube 15 is provided with a valve casing 16, in which is a yieldinglyclo'sed check valve 17. The valve 17 will open to permit air to be drawn into the tubes 13 and 15, but will close to prevent a reverse flow. The said tubes, 13 and 15 and said valve therefore, operate as pump elements as will presently be more fully described.

The outer portion of outlet tube 141- works telescopically in the co-operating leg of a U- shaped outer tube 18. The first noted leg of this tube 18 is screwed or otherwise rigidly secured to cylinder head 6, and its other leg,

, by a short tube 19 and coupling 20, is conleads therefrom, and to the end of which,

` continuous detlecting partition or ivcb 26 that causes the air to take. the circular' course in passing from intake port 21 to outlet port 22.

` Operation.

The operation is probably obvious from the foregoingv description, but briefly describedY is as follows:v When the piston is reciprocated, the tubes 13 and 14-v Will, of course, move therewith and Will slide telescopically Within the co-operating tube 16 and 18 respectively. When piston makes its Working stroke, air Will be dravvnA into tube 13 and: 15 through said valve controlled passage, andJ at such time such valve 25 will close to prevent an inflou7 ola air through tube; 23.

When piston makes its compression stroke or reverse movement, check valve 17 will close and the air drawninto the tubes 13 and 15, and'into the chambers oit' the piston andv cylinder, and into the tubes 14k and 18 will be put under compression and the greater part thereof WillV be eXhaustedthrough pipe 23, said valve 25 at this time opening freely to permit such discharge. By the circulation of cold air through the cylinder and piston, as` above described, the air is broughtinto contact with a large amount of y surface of both thereof, andas the circulation oa-ir Will be proportioned to the speedv of the piston, both vthe cylinder and the piston will be kept properly cooled. Of course, it is not desirableto keep either, thereof, cold, but only to prevent them from becoming too high in temperature an d particularly to cause equal expansion and contraction of the cylinder and piston. These objects are accomplished by the above described means.

"What 'I claim is:

1. The combination With the cylinder and piston of an internal combustion engine, said piston and the head of said cylinder having an air chamber therein, of parallel air intake and discharge tubes connected to the air chamber of said piston, movable with said piston and Working through the cylinder head, an outer air intake tube fixed tothe cylinder head' and in which said air intake tube Works telescopical'ly, said outer air intake tube being connected to the atmosphere andv having an inwardly opening check valve, a U-shapedk tube fixed to the cylinder head, opening into the air chamber of said head andl having a portion in which the air discharge tube from said piston chamber Works telescopically, anda final air discharge conduit leading from the air chamber of the cylinder head and. equipped With-1 an outwardly opening check valve.

2. The structure set iorthin claim 1, said parallel air intake and discharge tubes connected to the piston iitting in and slidable respectively in the outer air'inta'ke tube and the Ushaped tube secured to the cylinder head.

In testimony whereof I aliX my signature in presence ot two Witnesses.

JOHN EDMAN.

Witnesses:

CLARA` DEMAREST, F. D. MERCHANT. 

